Add dcb support to dracut's FCoE support (rh563794)

Note that there are still some patches queued upstream for fcoe-utils to
enable it to work with the new lldpad and to add support to fipvlan to
bring up FCoE connections without requiring fcoemon to run.

The invocations of the various tools as in this patch should be final though,
see the discussion in:
http://bugzilla.redhat.com/show_bug.cgi?id=563794

This is the second revision of this patch, which no longer adds /etc/fcoe
to the initrd as that is not needed.

modules.d/95fcoe/fcoe-up

@@ -6,6 +6,8 @@
 # Note currently only nodcb is supported, the dcb option is reserved for
 # future use.
 
+PATH=$PATH:/sbin:/usr/sbin
+
 # Huh? Missing arguments ??
 [ -z "$1" -o -z "$2" ] && exit 1
 
@@ -13,4 +15,14 @@ netif=$1
 dcb=$2
 
 /sbin/ip link set "$netif" up
+if [ "$dcb" = "dcb" ]; then
+    # Note lldpad will stay running after switchroot, the system initscripts
+    # are to kill it and start a new lldpad to take over. Data is transfered
+    # between the 2 using a shm segment
+    lldpad -d
+    dcbtool sc "$netif" dcb on
+    dcbtool sc "$netif" app:fcoe e:1 a:1 w:1
+    fipvlan "$netif" -c -s
+else
     echo -n "$netif" > /sys/module/fcoe/parameters/create
+fi

modules.d/95fcoe/install

@@ -1,6 +1,9 @@
 #!/bin/bash
 
-dracut_install ip
+dracut_install ip dcbtool fipvlan
+
+inst lldpad
+mkdir -p "$initdir/var/lib/lldpad"
 
 inst "$moddir/fcoe-up" "/sbin/fcoe-up"
 inst_hook pre-udev 60 "$moddir/fcoe-genrules.sh"

modules.d/95fcoe/parse-fcoe.sh

@@ -39,8 +39,7 @@ parse_fcoe_opts() {
 
 parse_fcoe_opts
 
-# currently only nodcb is supported
-if [ "$fcoe_dcb" != "nodcb" ] ; then
+if [ "$fcoe_dcb" != "nodcb" -a "$fcoe_dcb" != "dcb" ] ; then
     die "Invalid FCoE DCB option: $fcoe_dcb"
 fi